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利用透射电子显微镜对３０ＣｒＮｉ３ＭｏＶ低合金钢正交切削试验中切屑上的绝热剪切带（ＡＳＢ）、基体和两者之间过渡区的微观组织进行了观察和分析。指出ＡＳＢ形成时微观组织经历了由粗大板条结构到碎化以及动态回复的过程，最终变成ＡＳＢ的细小等轴结构。ＡＳＢ形成中碎化组织的动态回复是软化的本质。
Transmission electron microscopy (TEM) was used to observe and analyze the ASB, the matrix and the microstructure of the transition zone between the two in the orthogonal cutting test of 30CrNi3MoV low-alloy steel. It is pointed out that the microstructure of ASB undergoes the process from coarse lath to fragmentation and dynamic recovery and finally becomes the fine equiaxed structure of ASB. The dynamic response of fragmented tissue in ASB formation is the essence of softening.